Messages in this thread | | | Date | Mon, 14 Jan 2019 15:49:07 -0500 | From | Konrad Rzeszutek Wilk <> | Subject | Re: [PATCH 1/3] swiotlb: Export maximum allocation size |
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On Fri, Jan 11, 2019 at 10:12:31AM +0100, Joerg Roedel wrote: > On Thu, Jan 10, 2019 at 12:02:05PM -0500, Konrad Rzeszutek Wilk wrote: > > Why not use swiotlb_nr_tbl ? That is how drivers/gpu/drm use to figure if they > > need to limit the size of pages. > > That function just exports the overall size of the swiotlb aperture, no? > What I need here is the maximum size for a single mapping.
Yes. The other drivers just assumed that if there is SWIOTLB they would use the smaller size by default (as in they knew the limitation).
But I agree it would be better to have something smarter - and also convert the DRM drivers to piggy back on this.
Or alternatively we could make SWIOTLB handle bigger sizes.. > > Regards, > > Joerg
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